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Cardiovascular 2018 > Cardiac Cycle > Flashcards

Cardiac Cycle Flashcards

1
Q

What is the cardiac cycle?

A

The events between the start of one heart beat to the next

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2
Q

What is the atrial pressure in passive filling?

A

Close to 0

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3
Q

What happens in passive filling?

A

AV valves open so venous return flows into the ventricles

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4
Q

What is aortic pressure in passive filling?

A

80mmHg

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5
Q

What percentage of the ventricles are filled in passive filling?

A

80%

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6
Q

What signals atrial depolarisation on an ECG?

A

The P wave

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7
Q

When do the atria contract on an ECG?

A

Between the P wave and the QRS

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8
Q

What does atrial contraction do?

A

Completes the EDV

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9
Q

When does ventricular contraction occur on the ECG?

A

After the QRS

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10
Q

What happens to the pressure in isovolumetric ventricular contraction?

A

Ventricular pressure rises, when it exceeds atrial pressure the AV valves shut

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11
Q

Why is there no blood movement in isovolumetric contraction?

A

The aortic valve is still shut and pressure rises

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12
Q

When does ventricular ejection occur?

A

When the ventricular pressure exceeds aorta/pulmonary artery pressure and the Aortic and Pulmonary valves open

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13
Q

What happens to aortic pressure in ventricular ejection?

A

Rises

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14
Q

What signals ventricular repolarisation on the ECG?

A

The T wave

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15
Q

What happens to ventricular pressure in ventricular ejection

A

Starts to fall after ejection

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16
Q

when do aortic and pulmonary pressure valves shut

A

when the ventricular pressure falls below aortic and pulmonary pressure

17
Q

What causes the dicrotic notch?

A

The valve vibration

18
Q

What signals the start of isovolumetric ventricular relaxation?

A

Closure of aortic/and pulmonary valves

19
Q

What signals a new heart cycle

A

When ventricular pressure falls below atrial pressure and AV valves reopen

20
Q

What causes the first heart sound?

A

Closure of mitral and tricuspid valves

21
Q

What causes the second heart sound?

A

Closure of aortic and pulmonary valves

Cardiovascular 2018 (39 decks)

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